MUMBAI, India, July 7 -- Intellectual Property India has published a patent application (202641080728 A) filed by Ms. Anitha C; Dr. Vivek Singh; Dr. Ajay Kumar Dwivedi; and Dr. Nagesh Kallollu Narayanaswamy on June 30, 2026, for Compact Wideband Antenna System With Improved Broadside Radiation Characteristics.
Inventors include Ms. Anitha C; Dr. Vivek Singh; Dr. Ajay Kumar Dwivedi; and Dr. Nagesh Kallollu Narayanaswamy.
The application for the patent was published on July 03, 2026, under issue no. 27/2026.
Abstract: The invention relates to a compact wideband antenna system with improved broadside radiation characteristics comprises a microstrip-fed slot antenna radiating element and a structurally decoupled metasurface reflector array positioned underneath across a predetermined air gap. The radiating element includes a defected ground structure configured as an L-shaped slot to optimize electrical current channels and broaden impedance bandwidth. The metasurface reflector array features a periodic arrangement of multi-layer unit cells establishing an epsilon-negative property over an operating frequency band of 6.6 GHz to 8.5 GHz. Each unit cell includes a top layer with two concentric rectangular conducting rings having capacitive slot cuts, and a bottom layer with a single continuous rectangular conducting ring. This configuration establishes an inductive-capacitive resonance that controls the electromagnetic reflection phase. Consequently, reflected waves constructively interfere with broadside directed waves, minimizing surface-wave leakage, enhancing front-to-back radiation ratio, and achieving a peak broadside gain of approximately 7.5 dBi.
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